Yasir Arefin

Seasoned Senior Software Engineer with 10+ years in Ruby, Python, and Node.js, developing scalable backend systems for finance and logistics platforms. Proficient in PostgreSQL SQL databases, GraphQL/REST APIs, CI/CD with Docker/Kubernetes, TDD/Jest, and quality assurance. Proactive Scrum collaborator committed to continuous improvement and expanding product portfolios.

Finlex GmbH, Frankfurt | Senior Software Developer | 01/2021 - Present 

▪ Developed a digital insurance platform for 10,000+ users with Ruby, Node.js, and Python

▪ Improved API performance (+30%) through Redis caching and optimized data structures

▪ Integrated LLMs (LangChain) to automate content (+25% engagement)

▪ Automated CI/CD pipelines with Docker & Kubernetes (-20% deployment time, higher reliability)

▪ Architecture decisions, code reviews, TDD

Check24, Mainz | Software Engineer | 11/2019 - 05/2020

▪ Built a PHP backend for a digital banking platform

▪ Optimized pipelines with algorithms (priority queues, sorting) → -30% latency

▪ Implemented Docker microservices in a cloud environment (prepared for Kubernetes)

Software Engineer / Developer (Earlier Roles) | 08/2008 - 07/2018

▪ Software Engineer (Part-Time), SFMS, Darmstadt | 08/2018 – 10/2019

▪ Developer (Part-Time), Orange Hive GmbH, Frankfurt | 02/2018 – 07/2018

▪ Software Engineer (Part-Time), Diekulturwirtschaft GmbH, Darmstadt | 05/2016 – 01/2018

▪ Software Engineer, BG Interactive Ltd, Dhaka | 02/2011 – 07/2014

▪ Web Developer, Trust IT (BD) Ltd, Dhaka | 03/2010 – 01/2011

▪ Open-Source Developer, Launch Interactive Media, Dhaka | 08/2008 – 02/2010

1. Technical University of Darmstadt, Germany

   Master’s Degree in Distributed Software Systems

2. Shahjalal University of Science and Technology, Bangladesh

   Bachelor’s Degree in Computer Science & Engineering